28660351440 has 80 divisors (see below), whose sum is σ = 101539536768. Its totient is φ = 6550937088.

The previous prime is 28660351439. The next prime is 28660351453. The reversal of 28660351440 is 4415306682.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8528187 + ... + 8531546.

Almost surely, 2^28660351440 is an apocalyptic number.

28660351440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28660351440 is an abundant number, since it is smaller than the sum of its proper divisors (72879185328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28660351440 is a wasteful number, since it uses less digits than its factorization.

28660351440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17059756 (or 17059750 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 28660351440 in words is "twenty-eight billion, six hundred sixty million, three hundred fifty-one thousand, four hundred forty".